package cn.edu.hqu.cst.activity5;

import androidx.appcompat.app.AppCompatActivity;

import android.content.Intent;
import android.content.SharedPreferences;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.Toast;

public class MainActivity extends AppCompatActivity
{
    SharedPreferences preferences;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        preferences = getSharedPreferences("count", MODE_PRIVATE);
        //读取SharedPreferences里的count数据
        int count=preferences.getInt("count" , 0);
        //显示程序以前使用的次数
        Toast.makeText(this ,"程序以前被使用了" + count + "次。",Toast.LENGTH_LONG).show();
        SharedPreferences.Editor editor =preferences.edit();
        //存入数据
        editor.putInt("count" , ++count);
        //提交修改
        editor.commit();
        Button btn1 = (Button) findViewById(R.id.btn1);
            btn1.setOnClickListener(new View.OnClickListener(){
                @Override
                public void onClick(View v){
                    Intent i = new Intent(MainActivity.this , SQL.class);
                    startActivity(i);
}
                });
    }
}


